<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图区域-->
        <el-card>
            <el-alert title="注意：只允许为第三级分类设置相关参数!" type="warning" :closable="false" show-icon>
            </el-alert>
            <!--选择商品分类区域-->
            <el-row class="cat_opt">
                <el-col>
                    <!--选择商品分类的级联选择框-->
                    <div class="block">
                        <span>选择商品分类: </span>
                        <el-cascader
                            v-model="selectedKeys"
                            :options="cateList"
                            :props="cateProps"
                            @change="handleChange">
                        </el-cascader>
                    </div>
                </el-col>
            </el-row>
            <!--tabs页签-->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!--动态参数表格-->
                    <el-table :data="manyTableData" border stripe>
                        <!--展开行-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag closable
                                  @close="handleClose(i, scope.row)"  
                                  v-for="(item, i) in scope.row.attr_vals" :key="i">
                                    {{item}}
                                </el-tag>
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <el-button 
                                    v-else 
                                    class="button-new-tag" 
                                    size="small" 
                                    @click="showInput(scope.row)"
                                    >
                                    + New Tag
                                </el-button>
                            </template>                            
                        </el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!--静态属性表格-->
                    <el-table :data="onlyTableData" border stripe>
                        <!--展开行-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag closable
                                  @close="handleClose(i, scope.row)"  
                                  v-for="(item, i) in scope.row.attr_vals" :key="i">
                                    {{item}}
                                </el-tag>
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <el-button 
                                    v-else 
                                    class="button-new-tag" 
                                    size="small" 
                                    @click="showInput(scope.row)"
                                    >
                                    + New Tag
                                </el-button>
                            </template>                            
                        </el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!--添加参数的对话框-->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!--修改参数的对话框-->
        <el-dialog
            :title="'修改'+titleText"
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            cateList: [],
            cateProps: { 
                expandTrigger: 'hover',
                label: 'cat_name',    
                value: 'cat_id',
                children: 'children'
            },
            selectedKeys: [],
            activeName: 'many',// 被激活的页签名称
            manyTableData: [],
            onlyTableData: [],
            addDialogVisible: false,
            addForm: {},
            addFormRules: {
                attr_name: [
                    {required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            },
            editDialogVisible: false,
            editForm: {},
            editFormRules: {
                attr_name: [
                    {required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            }
        }
    },
    created(){
        this.getCateList()
    },
    computed: {
        isBtnDisabled(){
            // 如果按钮需要被禁用，则返回true,否则返回false
            if(this.selectedKeys.length !== 3){
                return true
            }else{
                return false
            }
        },
        cateId(){
            // 当前选中的三级分类的id
            if(this.selectedKeys.length === 3){
                return this.selectedKeys[2]
            }else{
                return null
            }
        },
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    },
    methods: {
        async getCateList(){
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败')
            }else{
                this.cateList = res.data
                console.log(this.cateList)
            }
        },
        handleChange(){
            this.getParamsData()
        },
        async getParamsData(){
            if(this.selectedKeys.length !== 3){
                // 选中的不是三级分类
                this.selectedKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }else{
                console.log(this.cateId)
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                {params: {sel: this.activeName}})
                if(res.meta.status !== 200){
                    return this.$$message.error('获取参数列表失败')
                }else{
                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals ? 
                        item.attr_vals = item.attr_vals.split(' ') : []
                        // 控制newTag文本框的显示与隐藏
                        item.inputVisible = false
                        item.inputValue = ''
                    })
                    console.log(res.data)

                    if(this.activeName === 'many'){
                        this.manyTableData = res.data
                    }else{
                        this.onlyTableData = res.data
                    }
                }
            }
        },
        handleTabClick(){
            this.getParamsData()
        },
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid){
                    return
                }else{
                    const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,
                    {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                    })
                    if(res.meta.status !== 201){
                        return this.$message.error('添加参数失败')
                    }else{
                        this.$message.success('添加参数成功')
                        this.addDialogVisible = false
                        this.getParamsData()
                    }
                }
            })
        },
        async showEditDialog(attr_id){
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
                {
                    params: {attr_sel: this.activeName}
                }
            )
            if(res.meta.status !== 200){
                return this.$message.error('获取参数信息失败')
            }else{
                this.editForm = res.data
                this.editDialogVisible = true
            }
        },
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        editParams(){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid){
                    return
                }else{
                    const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                    {
                        attr_name: this.editForm.attr_name,
                        attr_sel: this.activeName
                    })
                    if(res.meta.status !== 200){
                        return this.$message.error('修改参数失败')
                    }else{
                        this.$message.success('修改参数成功')
                        this.getParamsData()
                        this.editDialogVisible = false
                    }
                }
            })
        },
        async removeParams(id){
             const confirmResult = await this.$confirm('此操作将永久删除该参数，是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err);
            if(confirmResult !== 'confirm'){
                return this.$message.info('已经取消删除')
            }
            const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
            if(res.meta.status !== 200){
                return this.$message.error('删除参数失败')
            }else{
                this.$message.success('删除参数成功')
                this.getParamsData()
            }
        },
        handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 发起请求，保存这次操作
            this.saveAttrValue(row)
        },
        async saveAttrValue(row){
            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(' ')
                })
            if(res.meta.status !== 200){
                return this.$message.error('修改参数项失败')
            }

            this.$message.success('修改参数项成功')
        },
        showInput(row){
            row.inputVisible = true
            // 让newtag文本框自动获得焦点
            // $nexTick ：当页面上的元素被重新渲染之后，才会调用回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        handleClose(id, row){
            row.attr_vals.splice(id, 1)
            this.saveAttrValue(row)
        }
    }
}
</script>

<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .input-new-tag{
        width: 120px;
    }
</style>